Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.3 on date 21-09-2023 and time 14:35:57 (Italy) in region 5 km E Marradi (FI)

A magnitude ML 1.3 earthquake occured in region: 5 km E Marradi (FI), on

  • 21-09-2023 12:35:57 (UTC)
  • 21-09-2023 14:35:57 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 44.0700, 11.6790 at 7 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Marradi FI 5 3139 3139
Tredozio FC 5 1212 4351
Portico e San Benedetto FC 10 756 5107
Palazzuolo sul Senio FI 12 1154 6261
Premilcuore FC 13 799 7060
Rocca San Casciano FC 13 1910 8970
Modigliana FC 13 4560 13530
San Godenzo FI 17 1167 14697
Casola Valsenio RA 18 2617 17314
Dovadola FC 18 1653 18967
Brisighella RA 18 7639 26606

Municipalities with at least 50000 inhabitants

An earthquake occurred to
29 Km SW of Faenza (58541 inhabitants)
32 Km S of Imola (69797 inhabitants)
34 Km SW of Forlì (117913 inhabitants)
46 Km W of Cesena (96758 inhabitants)
48 Km NE of Firenze (382808 inhabitants)
51 Km E of Prato (191150 inhabitants)
53 Km NE of Scandicci (50609 inhabitants)
54 Km SE of Bologna (386663 inhabitants)
57 Km SW of Ravenna (159116 inhabitants)
63 Km E of Pistoia (90315 inhabitants)
69 Km N of Arezzo (99543 inhabitants)
71 Km W of Rimini (147750 inhabitants)
85 Km S of Ferrara (133155 inhabitants)
88 Km SE of Modena (184973 inhabitants)
88 Km NE of Siena (53903 inhabitants)
97 Km E of Lucca (89046 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.3 2023-09-21
12:35:57		 44.0702 11.6792 7 2023-09-21
12:47:29		 Sala Sismica INGV-Roma 121312891
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-09-21 12:35:57 ± 0.07
Latitude 44.0702 ± 0.0027
Longitude 11.6792 ± 0.0038
Depth (km) 7 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 121312891

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 288
Semi-minor axis of confidence ellipse (meter) 194
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 75
Circular confidence region, given by single value of horizontal uncertainty (meter) 290.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 66
Number of associated phases, regardless of their use for origin computation 27
Number of defining phases 26
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.00000
Epicentral distance of station farthest from the epicenter (degree) 0.58276
Number of stations at which the event was observed 15
Number of stations from which data was used for origin computation 14
Magnitude information

ML:1.3

Field Value
Value 1.3
Uncertainty 0.3
Num. used stations 12
Type of magnitude ML
Reference to an origin 121312891
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-09-21 12:47:29
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.PARC.HHZ. 2023-09-21T12:36:18.89 1.0 undecidable manual S 136 64.6908 50 0.41 21
IV.CRE.HHZ. 2023-09-21T12:36:15.81 0.6 undecidable manual S 156 54.6009 50 0.03 47
IV.FNVD.HHZ. 2023-09-21T12:36:14.64 3.0 undecidable manual S 1.53 0
IV.PARC.HHZ. 2023-09-21T12:36:09.58 1.0 undecidable manual P 136 64.6908 50 -0.15 23
IV.BOSL.HHZ. 2023-09-21T12:36:08.06 0.6 undecidable manual S 238 28.8489 103 0.03 49
IV.RUFI.EHZ. 2023-09-21T12:36:08.05 0.6 undecidable manual S 208 29.0487 103 -0.08 49
IV.CRE.HHZ. 2023-09-21T12:36:07.68 0.3 negative manual P 156 54.6009 50 -0.49 64
IV.SEI.HHZ. 2023-09-21T12:36:06.93 0.6 undecidable manual S 266 25.6521 105 -0.03 50
IV.SFI.EHZ. 2023-09-21T12:36:06.21 0.6 undecidable manual S 144 22.6551 106 0.23 48
IV.VISG.HHZ. 2023-09-21T12:36:06.40 0.3 undecidable manual S 304 23.5542 106 0.14 73
IV.RINC.EHZ. 2023-09-21T12:36:05.78 0.3 undecidable manual S 196 21.1677 108 0.31 71
IV.VMGN.HHZ. 2023-09-21T12:36:04.37 0.6 undecidable manual S 222 17.3715 111 0.15 49
IV.IMOL.HNZ. 2023-09-21T12:36:04.33 1.0 undecidable manual P 9 32.5452 102 -0.09 24
IV.MTRZ.HNZ. 2023-09-21T12:36:04.53 1.0 undecidable manual P 323 33.6441 101 -0.12 24
IT.MOG.HNZ. 2023-09-21T12:36:03.28 0.6 undecidable manual S 32 13.1757 117 0.4 47
IV.BOSL.HHZ. 2023-09-21T12:36:03.65 0.6 negative manual P 238 28.8489 103 -0.05 49
IV.RUFI.EHZ. 2023-09-21T12:36:03.48 0.3 undecidable manual P 208 29.0487 103 -0.27 71
IV.SFI.EHZ. 2023-09-21T12:36:02.49 0.1 positive manual P 144 22.6551 106 -0.02 100
IV.VISG.HHZ. 2023-09-21T12:36:02.57 0.6 negative manual P 304 23.5542 106 -0.1 49
IV.SEI.HHZ. 2023-09-21T12:36:02.86 0.6 negative manual P 266 25.6521 105 -0.21 48
IV.RINC.EHZ. 2023-09-21T12:36:02.30 1.0 positive manual P 196 21.1677 108 0.09 25
IV.VMGN.HHZ. 2023-09-21T12:36:01.70 0.1 positive manual P 222 17.3715 111 0.21 97
IT.MRR.HGZ. 2023-09-21T12:36:00.86 0.3 undecidable manual S 264 6.0939 138 -0.04 77
IT.MOG.HNZ. 2023-09-21T12:36:00.93 0.1 undecidable manual P 32 13.1757 117 0.21 98
IT.MRR.HGZ. 2023-09-21T12:35:59.60 0.3 undecidable manual P 264 6.0939 138 0.02 77
IV.LMD.HHZ. 2023-09-21T12:35:59.02 0.3 undecidable manual P 70 2.3976 160 -0.17 75
IV.LMD.HHZ. 2023-09-21T12:35:59.88 0.3 undecidable manual S 70 2.3976 160 -0.35 73
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.VMGN.HHE. ML:1.1 0.0001205 1.12 AML other m 2023-09-21T12:36:05.67
IV.VMGN.HHN. ML:1.2 0.0001365 1.46 AML other m 2023-09-21T12:36:05.11
IV.SFI.EHE. ML:1.4 0.000175 0.18 AML other m 2023-09-21T12:36:06.33
IV.VISG.HHN. ML:1.2 0.0001004 0.62 AML other m 2023-09-21T12:36:06.63
IV.SFI.EHN. ML:1.3 0.0001485 1.52 AML other m 2023-09-21T12:36:06.90
IV.VISG.HHE. ML:1.0 0.00007595 0.72 AML other m 2023-09-21T12:36:07.41
IV.SEI.HHE. ML:1.5 0.000175 0.32 AML other m 2023-09-21T12:36:07.61
IV.SEI.HHN. ML:1.6 0.0002635 0.34 AML other m 2023-09-21T12:36:07.58
IV.BOSL.HHN. ML:0.9 0.0000375 0.58 AML other m 2023-09-21T12:36:08.27
IV.BOSL.HHE. ML:0.9 0.00003795 0.74 AML other m 2023-09-21T12:36:09.26
IV.CRE.HHN. ML:1.7 0.00011949999999999999 0.2 AML other m 2023-09-21T12:36:16.12
IV.CRE.HHE. ML:1.4 0.00005665000000000001 0.18 AML other m 2023-09-21T12:36:16.19
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download